5) You can connect the Mini to a LCD TV and watch your favorite shows and movies downloaded from the internet.
6) With a big LCD display or a LCD TV you can have the beautiful album artwork displayed while playing back music.
I tried all, Squeezebox, Transporter and Mac Mini at home and decided the Mini route. In the end it came down to the user interface - I could not stand the user interface for Slimserver and the fact that Slimdevices is now Logitech (which is really just a personal preference ;).
I did prefer the Mini via USB sonically to the Transporter, Squeezebox, and Mini Toslink out by a small margin (using the Benchmark USB DAC).